Calipers.



PATENTED AUG. 22, 1905.

J. H. COOK.

GALIPERS.

APPLICATION FILED JULY 29, 1904.

wwrt T665566 AWMWM UNITED STATES PATENT OFFICE.

JAMES H. COOK, OF ATHOL, MASSACHUSETTS, ASSIGNOR TO THE SAWYEB TOOLMANUFACTURING COMPANY, OF EITCHBURG, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

CALIPEHS.

Specification of Letters Patent.

Patented Aug. 22, 1905.

Application filed July 29, 1904. Serial No. 218,681.

To all whom zit may concern.-

Be it known that LJAMES H. COOK, acitizen of the United States, residingat Athol, in the county of Worcester and State of Massachusetts, haveinvented a new and useful Calipers, ofwhich the following is aspecification.

Calipers and other similar instruments are provided with afriction-joint between two members thereof, which joint may be tightlyset, so that the members will be tightly held in their adjustedpositions. It has been found desirable to provide a joint of thischaracter with beeswax or some similar compound between the membersthereof to prevent wear as the parts are adjusted under the friction andto prevent oxidation in the parts interfering with the smooth actionthereof.

The object of this invention is to construct a joint of this characterso that it may contain a compound of this nature.

Referring to the drawings, Figure 1 is an elevation of a pair ofcalipers constructed to embody my improvements. Fig. 2 is a detail viewof the parts which make up the adjustable point, and Fig. 3 is a detailview of the parts which make up the adjustable joint.

In detail, A and B designate the two legs of the calipers. The leg A hasa round hole bored through the upper end thereof, and the part B has asquare hole punched in the upper end thereof. As the joint is assembleda friction-washer Cis placed between the two legs A and B and afriction-washer D is placed on the outside of the leg A. A nut E is theninserted through these four parts. This nut has a rim 10 about the sizeof the washer D, a cylindrical portion 11, which fits in washer D, legA, and washer C, and a square portion 12, which engages the square holein leg B. Either or both washers may be omitted in some constructions.Alarge-headed screw F is threaded into the nut E to make up the jointand the screw is tightly brought to place, so that the joint will have astiff friction action. It will be seen that as the legs A and B aremoved relatively to each other there can be friction between the rim 10and the washer D, between the washer D and the leg A, be tween the leg Aand the washer C, and between the washer C and the leg B, but that therecan be no friction between the leg B and the head of the nut F.

To provide against wear of the joint and to keep the same fromoxidation, holes are bored in the washers C and D and in the upper endof the leg A, and these holes are filled with some suitable compound, asbeeswax. These holes act as reservoirs or pockets to retain thecompound, and this construction will keep the joint in proper shape fora long time and under constant use.

The lower end of the leg B is turned up, as at 14, and a hole 15 isbored through the same. A groove 16 is formed on the side of the leg, asshown. A slotted collar 17 is brazed or secured over the slot 1'6, andprojecting from the same is a screw-threaded shank 18. A point 19 can beinserted in the hole 15, slid up the groove 16, through said collar 17,and held in place by a check-nut 20, threaded on the shank 18. Thisprovides a simple adjusting means for rigidly holding the point inposition on the leg B.

The details herein described may be greatly varied by a skilled mechanicwithout departing from the scope of my invention as expressed in theclaims.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

1. A calipers or similar instrument made up of two members, one having acircular hole, and the other a non-circular hole, a nut having acircular rim to fit the circular hole in one member, and a non-circularportion to fit the non-circular hole in the other member, a large-headedscrew threaded into said nut to hold the members together, and holesinthe member which has the circular hole in which a lubricating compoundis placed.

2. A calipers or similar instrument made up of two members, one having acircular hole, and the other a non-circular hole, a nut having acircular rim to lit the circular hole in one member, and a non-circularportion to lit the non-circular hole in the other member, a large-headedscrew threaded into said nut to hold the members together, a washerinterposed between the members, and another washer interposed betweenthe nut and the member having the circular opening, said washers havingholes in which a lubricating compound is placed.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JAMES H. COOK. Witnesses:

JOHN T. CLARKE, EVAN EVANS.

